Fluid filtering and metering device



April 21, .1953 w. KASTEN 2,635,641

FLUID FILTERING AND METERING DEVICE Filed Dec. 22. 1947 IE EE- Patented Apr. 21, 1953 UNITED STATES Application December 22, 1947, Serial No. 793,303

8. Qletme- 13 7 The. hteeeh h ehti ht ie e he e flu d ew filterin eht me hihe e 'ee h. ih il e ete hz h echve h hi me er n s tems where n e htrel stem. d there e e relatively me l rifice i heetl 9 eht e fluiei ew hlt se et mee hee teret in prev ntin th e ifie th i be n e thete by im ur i s i he hhitlhi m e ireve theueh t e ti e h be t fil red n r r to rawin s, the flu d. how t reih r htte. eft eh: terihe. t e l r ed e et eh e t el ewj he nter or at '8 and. lea n at 201. he the, e -1 hem o e s ine het are settled Q flhiQ1 v-;,t el t,ie hihv y n ah ilereeeli his 2 i e e eet in an i ternal groove '44 of; eiiie e '5 thin '3 k T e f ui l ri en mete n deY ee $9 erally shown at numeral 16,, includes a holldw the metering orifice by a filtering element hav 10 fluid filtering element 276, r i rhbiy q ftgngegge m a. eeh ieteh eih'eher'here e h th n he Si e type sup ed b wee ehei h ete 9 ai d e said, rifi e, e hee iihfiiterabie hartie eee h arti i 2 and el i 'a chmeh with the his tmu n t e filter n el me ma aee me ete of s i nd at by a ehhh rheh e fi eh and th s t rm a mee he ar e hee th ehe h i e na su t aid hlt'tteihd. me e 30 the. meterin rihee. r th that e e ih ete 1 and pa t n 32 are h e iees With ee ii eihhei around t e. orifice and rest et e h 9? i a d 4. seated i h e req l e 42 end 3 the ethi'eueht t i .v herete e he 9 e, hr h e e ti e m r a n a in a u dfr 'teh e e pal b e s o he sent h h ie t hteviqe h t e hih b t e n t ihte fh l el f e lew flu d m t n tieviee edeh tt t he e t h i h' nt ri r a th i he es of ee d e d l e '3 mal quant ies e rfl d ever 19 1.8 b iede f t m 20 an ti n 3. h is t eme ed te th 5f wit hut heeemihe e et ietee ei e h eeieb h he sphh a t ev d vide i t a f id in et eh. m,- stricted by impurities in the fihidber .41 filt am er 55 and h. fluid O tl t. eh ht: Another object of the invention is to pg'ovide a her 43, A hollow mgteping element; 5]] i mgufited novel d vice t r me iheeihell q ieht i e of in alignment w th he filte he le nt 3 e f uid w h c b e ly h fh et d h a fl d he hhee te i e of ar ti n 3, he ie'e eetl ch e et m n m l hem e e hveh i h l. m t rin the hd pp e s tition y a eea he l e rifi e w tho n es it ti eh etlieei eheiie e a A plurality o fluid aeeae 5. are'bmtieed in ai e stemi d h eti 3 a a, a e en a hele is A fur her ebieet e? the. ih eh ihh is. t htev d prov d d n ha ieh 3.2 t p rmit lui o a m ac hhi fil r-me eh l meterihe d ice pass fr m ch mb 4 in o ha ber 4 ahe hehee whieh. ca b a hie eti to very hhhl't heehel ihte h mber Q B The assem con is h hi end he e ar'aeterieti e hi he. filterin ht m te ih pla e t fi1te l hie t 2 a ti n 32 mete in elements. 7 element 50 and sealing plate 5| is held rigidly in u her h eets end d ehthee wil be e f h' its assemble position by a bo 56 wh h passes eht fr the following crip i n end eeee 35 h ou h a c nt al h le in plate 39, the internal pahyi e dr w n where WO hee 'i elhh 'ihamb r o t fi e n a d mete em nts mehte e the f u d hl erih eh? me er he et v e an through th e a h le n ar tion 32 and a e ei eht In t e dre w h e sealin pl te 5!- This bolt, ogeth h :a hut Figure 1 is a vertical eress-seetiqh 9i the H???" 5 se ves s a means for ad usti th s ze of eht fiqit fl tee he meterin de e ehewi he or s f the filter i met n element eai device a mbledi fluid hh he eth For example, the pore s e o the two elements F-ie h 2 e a ver i -e eh o h mee is decreased when sai elements are compressed h e term of h r nt f u lte n hhq heterb the i h e in o ut t d sed when the evi e assembled in h fluid ehh hl li said e eme s e pan on the loosenin o aid ut- Ite et th mo e ehee teell t9 t e drewihee When the Yan tze p ts o e fluid f lte in and umeral l2 desi nates the al por n of e h lmeterin nit ave e em e on bolt 56 10w spline s a hu ral M he f m le. por on an sech et t eon b ne 8 t e unit is. 13.- thereof, and It; a uid filterin and m terihe ee tesi in he eh hreee he t eh th li e ehett dev ce m unt d n an enlar ed eect eh e eem ehe eee ir hl there h b ehihe t t e .553 Whieh nartment of he hellew in r q eaid e e f t eee te h h thh i" reet .5 hhd th e hteveht th eeid 'hQHQ-W iht rie te m he e eeh hiit for e flute e hhreeie le ax l. imqv meht 9i e tl hhit the 5.14. 1 e. uhh cat h oil delive ed r m the hihriehlf fe hltetihh bertieh Q? the th eati hy tem 9i h en ine t the hea in s. Qt he li ter h eteiheht Z5 the methih eleeehei e et driven by aid en in th ugh the ment 9 the h fef rebh 9f he S eh hv enlihe ehaftthe e J JQP QI! ,ehht h th the ethhe ihh ehet eeheiet 9? e hhithhty 9? washer-like layers, either as individual layers or as the convolutions of a helically wound unit, having radial pore between each layer to provide passages for the fluid being filtered and metered. The layers of the filtering and metering elements may be of a fibrous material held together by a discontinuous bond so distributed that radial pores are formed between the layers at frequent intervals. The discontinuity of the bond may be controlled by using a paper or fibrous material having a predetermined rugosity on both surfaces thereof so that the valleys of the rugosities form the passages and the peaks thereof form the points of contact between the adjacent layers.

In the operation of the device shown in Figure 1, fluid, such as oil under pressure from the oil pump of an engine is forced through the shaft into inlet chamber A l. The fluid then passes through orifices 52 into filter chamber 46, thence through filter element 26 into the internal portion thereof. This filtered fluid flows through the central opening 54 of partition 32 into the internal portion of metering element 58. The fluid then'passes slowly through the metering element into outlet chamber 63 and thence through the outlet passage 25. In this arrangement it is seen that the fluid before passing through the metering element is filtered by an element of a pore size at least as small as the pore size of the metering element so that the particles of foreign matter entrained in the fluid will be removed before the metering element is reached. Most of the foreign matter will collect on the exterior surface of filtering element 25 which has a much greater area than the internal surface of metering element 58. The metering of the fluid by element 56 is accomplished by seepage of the fluid through pores over an extensive area of the internal surface of said element; consequently, the accumulation or agglomeration of fine particles of foreign matter on said area does not materially restrict or obstruct the relatively slow flow of fluid through the metering element.

The construction of the fluid filtering and metering device shown in Figure 2 is similar in many respects to that shown in Figure 1, thus the same numerals will be used on identical parts appearing in both embodiments. The spline shaft is provided with a compartment for receiving the fluid filtering and metering device and includes an internal passageway having fluid inlet 18 and a fluid outlet 28 for said compartment. The fluid filtering and metering device generally shown at 18 has a core with an enlarged end 12 forming an end plate comparable to that shown at SS in Figure 1. Another end plate 78 is mounted on core iii. These two end plates are sealed in fluid-tight relationship with the wall of the compartment by annular gaskets 86 and B2, respectively, to divide said compartment into inlet chamber 44, filter chamber 46 and fluid outlet chamber 48, as in Figure 1. The filter element 26 and metering element 50 are separated from one another by a partition 19 which is preferably constructed of rubber or similar material and is fitted snugly around core 1!) to prevent the fluid from flowing from the internal portion of the filtering element to the internal portion of the metering element without first passing through said elements. A nut 84 is threaded onto core iii to rigidly secure end plate 18 and the filtering and metering elements in their assembled position. A recess 86. and ports 88 are provided in the inlet end of the core for receiving 4 the fluid from inlet [8 and delivering it to the internal portion of the filtering element. Another recess 9B and cooperating ports 92 are provided in the outlet end of said core for receiving fluid from the internal portion of the metering element and delivering it to chamber 53. As shown in Figure 2, a tube 94 is provided to connect inlet 18 with recess 86 and is preferably sealed in fluid-tight relationship with said recess by a gasket 95 seated in annular groove 98 of support member it. The fluid filtering and metering unit is held in operative position in the enlarged portion of the spline shaft by locking ring 62 similar to that shown in Figure 1. The filtering and metering elementsof the modification shown in Figure 2 are of the same general construction as those of Figure 1.

In the operation of the device shown in Figure 2, the fluid such as oil flows through inlet i8, tube 94, recess 86 and orifices 88 into the internal portion of filtering element 26. After the fluid has passed through the filtering element, it flowsthrough the metering element, thence through orifices 92 into recess 96 and passes from the filtering and metering unit through chamber 43- and outlet 20. The pore size of the filtering and metering elements is controlled by the same method as that described in connection with Figure 1. To increase or decrease the compres-- sion on said elements, nut 84 is either tightened or loosened.

It is contemplated that other arrangements ofelements than those shown in the accompanying drawings may be made without departing from the scope of the present invention. For ex ample, the filtering and metering elements may be mounted in the fluid passageway at widely separated points, or in certain applications, the metering element may be used alone in the passageway. Additional modifications of the present fluid filtering and metering device as well as other uses therefor will occur to those skilled in the art.

I claim:

1. A device for filtering and metering fluid in a passageway comprising a cylindrical filtering element of compressible material having radial pores therein; a metering element of compressible material axially aligned with and operatively disposed downstream from said filtering element and composed of a plurality of washer-like layers having radial pores therebetween; a partition having a centrally located hole therethrough between said elements; imperforate end plates on said elements opposite said partition, said partition and plates being so constructed and arranged that the fluid first passes through said filtering element and then through said metering element; and a means for varying the pore size of said elements.

2. A device for filtering and metering fluid in a passageway comprising an edge type filtering element of compressible material having radial pores therein disposed in said pasasgeway; a hollow metering element of compressible material disposed in said passageway downstream from said filtering element and composed of a plurality of axially arranged layers having radial pores therebetween; a partition having a centrally located hole therethrough between said elements; imperforate end plates on said elements opposite said partition, said partition and plates being so constructed and arranged that the fluid first passes through said filtering element and then through said metering element; and means adapted to apply pressure simultaneously to said between; a partition between said elements having an orifice connecting the internal portion of said elements, said partition being adapted to form a fluid-tight relationship with the side walls of said passageway; plates closing the ends of said elements opposite said partition whereby the fluid being filtered and metered passes inwardly through the filtering element into the internal portion thereof, then through the orifice of the partition into the internal portion of the metering element and outwardly through said metering element; and means adapted to apply pressure simultaneously to said elements for varying the flow capacity thereof.

4. A device for filtering and metering fluid in a passageway comprising a hollow cylindrical filtering element of compressible material having radial pores therein, disposed in said passageway and spaced from the side walls thereof; a hollow cylindrical metering element of compressible material disposed in said passageway downstream from said filtering element, said metering element being composed of a plurality of washerlike layers having radial pores therebetween; a partition between said elements having an orifice connecting the internal portion of said elements, said partition forming a fluid-tight relationship with the side walls of said passageway; plates closing the ends of said elements opposite said partition; and means extending axially through said plates, filtering and metering elements, and said orifice, and having an adjustable member thereon for simultaneously varying the pore size of said elements.

5. A device for filtering and metering fiuid in a passageway, the combination of a filtering element having radial pores therein; a hollow metering element axially aligned with and operatively disposed downstream from said filtering element and composed of a plurality of axially arranged layers having radial pores therebetween connecting the internal portion of said element with the surface thereof; and a means for applying pressure to said elements to vary the flow capacity of said radial pores.

6. A device for filtering and metering fluid in a passageway comprising a core; a hollow cylindrical filtering element having radial pores and mounted on said core in spaced relation therefrom; a hollow cylindrical metering element having radial pores and mounted on said core and spaced therefrom, said metering element being composed of a plurality of axially arranged layers having radial pores therein; a partition between said elements forming a fluid-tight relationship with said core; end plates opposite said partition having central passages therethrough communicating with the internal portion of said elements, said plates forming an external chamber about said elements whereby the fluid being filtered and metered passes outwardly through the filtering element into said external chamber and then inwardly through the metering element and a means on said core adapted to adjust simultaneously the pore size of said element by applying end pressure thereto.

7. A device for filtering and metering fluid in a passageway comprising a core; a hollow cylindrical metering element having radial pores and being mounted on said core in spaced relation therefrom and adapted to be spaced from the side walls of said passageway; a hollow cylindrical metering element mounted on said core and spaced therefrom and adapted to be spaced from the side walls of said passageway, said metering element being composed of a plurality of axially arranged layers having radial pores therebetween; a partition between said elements forming a fluid-tight relationship with said core and adapted to be spaced from the side walls of said passageway; end plates opposite said partition having central passages therethrough communicating with the internal portion of said elements, said plates being adapted to engage the side walls of said passageway in fluid-tight relationship to form an external chamber about said elements whereby the fluid being filtered and metered passes outwardly through the filtering element into said external chamber and then inwardly through the metering element; and a means cooperating with said core for adjusting simultaneously the pore size of said elements by applying end pressure thereto.

8. A device for filtering and metering fluid in a passageway comprising a core; a hollow cylindrical filtering element having radial pores and being mounted on said core in spaced relation therefrom and adapted to be spaced from the side walls of said passageway; a hollow cylindrical metering element mounted on said core and spaced therefrom and adapted to be spaced from the side walls of said passageway, said metering element being composed of a plurality of axially arranged layers having radial pores therebetween; a partition between said elements forming a fluid-tight relationship with said core and adapted to be spaced from the side walls of said passageway; plates opposite said partition having central passages therethrough communicating with the internal portion of said elements, said plates being adapted to engage the side walls of said passageway in fluid-tight relationship to form an external chamber about said elements; and a means cooperating with said core to vary simultaneously the pore size of said elements.

WALTER KASTEN.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,581,998 Fulcher Apr. 20, 1926 2,042,462. Hahn June 2, 1936 2,118,295 Crawford et al. May 24, 1938 2,119,288 Raymond May 31, 1938 2,265,550 Smith Dec. 9, 1941 2,511,733 Morrison June 13, 1950 

